Real-time river flooding
across America.
Live USGS streamgauge readings, FEMA flood zones, NWS flood watches and warnings, and historical context — one map, refreshed throughout the day. Built for flood researchers, emergency managers, and outdoor recreationists.
What's happening right now
An AI-generated daily summary stitched from active streamgauge readings, NWS warnings, and watershed status.
The United States is confronting a dangerous multi-front flooding crisis as Hurricane Nolo threatens catastrophic flooding in Hawaii, Hurricane Polo menaces California's coast, and a powerful nor'easter batters the East Coast with hurricane-force winds and severe coastal flooding. Extreme streamflow measurements across the nation reveal water levels reaching up to 100 times normal capacity in some areas, with communities from the Midwest to Appalachia experiencing dangerous flood conditions. Emergency declarations are in effect across multiple states as officials warn residents to prepare for life-threatening flash floods, mudslides, and prolonged inundation.
The Midwest and Ohio River Valley face particularly dire situations, with communities near Fort Wayne, Indiana experiencing catastrophic conditions as the St. Marys River surges to 10,458% of normal flow. Toledo and surrounding areas along the Maumee River are seeing flows at 2,286% of normal, threatening widespread urban and agricultural flooding. In West Virginia, the town of Elkins faces extreme danger as the Tygart Valley River reaches 1,772% of normal capacity, while Johnstown, Pennsylvania confronts similar threats with the Conemaugh River at 1,613% of normal. Iowa communities are particularly hard-hit, with Des Moines area rivers—including the Des Moines River at 2,009% of normal and the South Skunk River at an astronomical 6,442% of normal—creating emergency conditions that threaten downtown areas, residential neighborhoods, and critical infrastructure.
The Southwest and Pacific regions face compounding threats as New Mexico's Pecos River system explodes to over 102,000% of normal flow near Carlsbad, creating unprecedented flash flood dangers in typically arid communities. Hawaii's Big Island braces for Hurricane Nolo's "catastrophic and life-threatening flooding" with emergency shelters on standby and federal assistance approved. Meanwhile, Southern California coastal communities from Long Beach to Laguna Beach prepare for massive swells and coastal flooding from Hurricane Polo, even as the storm remains offshore near Mexico. The East Coast nor'easter is already causing significant flooding in New Jersey and threatening New York City with 60 mph winds and coastal inundation, prompting states of emergency declarations across the region. Authorities urge residents in all affected areas to avoid travel, move to higher ground if in flood-prone areas, and prepare for extended power outages and road closures.
Rivers currently flooding or rising
Live USGS streamgauge readings aggregated by river. Percent-of-normal compares current flow to the seasonal average.
| River | Observed (cfs) | Seasonal avg (cfs) | vs. Normal |
|---|---|---|---|
| Black Warrior River | 2,070 | 2,830 | 73% of normal |
| Suwannee River | 5,420 | 7,030 | 77% of normal |
| Edwards River | 423 | 54 | ↑ 783% of normal |
| Wapsipinicon River | 10,900 | 618 | ↑ 1764% of normal |
| Root River | 248 | 18 | ↑ 1378% of normal |
| Tygart Valley River | 11,500 | 778 | ↑ 1478% of normal |
| Delaware River | 1,790 | 189 | ↑ 950% of normal |
| Olentangy River | 741 | 72 | ↑ 1029% of normal |
| Middle Raccoon River | 343 | 48 | ↑ 710% of normal |
| Nodaway River | 1,310 | 146 | ↑ 897% of normal |
| Pecos River | 12,812 | 174 | ↑ 7382% of normal |
| Mahoning River | 2,560 | 379 | ↑ 675% of normal |
| Shade River | 182 | 8 | ↑ 2373% of normal |
| Blackwater River | 208 | 27 | ↑ 762% of normal |
| Cumberland River | 2,850 | 308 | ↑ 925% of normal |
| Piedra River | 1,360 | 80 | ↑ 1711% of normal |
| Cedar River | 19,246 | 2,243 | ↑ 858% of normal |
| Animas River | 3,770 | 385 | ↑ 979% of normal |
| Tombigbee River | 6,705 | 8,916 | 75% of normal |
| Souris River | 260 | 41 | ↑ 636% of normal |
| Purgatoire River | 342 | 9 | ↑ 3826% of normal |
| Dolores River | 716 | 30 | ↑ 2371% of normal |
| Little Colorado River | 555 | 12 | ↑ 4625% of normal |
| Blanchard River | 619 | 60 | ↑ 1027% of normal |
| Teton River | 257 | 16 | ↑ 1577% of normal |
| North Canadian River | 556 | 30 | ↑ 1875% of normal |
| Iowa River | 7,970 | 342 | ↑ 2330% of normal |
| Buckhannon River | 1,750 | 36 | ↑ 4868% of normal |
| Samish River | 31 | 29 | 106% of normal |
| Straight River | 1,210 | 93 | ↑ 1305% of normal |
| Gauley River | 2,200 | 125 | ↑ 1760% of normal |
| Chariton River | 409 | 16 | ↑ 2509% of normal |
| Tolt River | 379 | 139 | ↑ 273% of normal |
| Stillwater River | 377 | 43 | ↑ 879% of normal |
| Tiffin River | 443 | 46 | ↑ 974% of normal |
| Scioto River | 20,940 | 1,795 | ↑ 1167% of normal |
| Raccoon River | 1,310 | 193 | ↑ 679% of normal |
| Youghiogheny River | 1,105 | 127 | ↑ 869% of normal |
| Williams River | 542 | 35 | ↑ 1549% of normal |
| Conemaugh River | 6,740 | 386 | ↑ 1746% of normal |
| South Platte River | 1,430 | 191 | ↑ 751% of normal |
| Cranberry River | 347 | 20 | ↑ 1735% of normal |
| Blue Earth River | 1,800 | 164 | ↑ 1098% of normal |
| Maumee River | 17,780 | 778 | ↑ 2287% of normal |
| Green River | 384 | 463 | 83% of normal |
| Casselman River | 707 | 90 | ↑ 790% of normal |
| Middle Fork River | 760 | 18 | ↑ 4222% of normal |
47 rivers are running elevated right now. Create a free account to see the full list, follow your rivers, and get alerts.
Create Free AccountWatersheds running elevated
Aggregated by HUC8 watershed code. Useful for catchment-level flood-risk assessment.
| HUC8 code | Watershed | Observed (cfs) | vs. Normal |
|---|---|---|---|
| h03110205 | Lower Suwannee | 5,420 | 77% |
| h12040104 | Buffalo-San Jacinto | 204 | ↑ 2914% |
| h10030203 | Marias | 257 | ↑ 1577% |
| h05030106 | Upper Ohio-Wheeling | 299 | ↑ 1208% |
| h11080008 | Revuelto | 295 | ↑ 4476% |
| h02050201 | Upper West Branch Susquehanna | 2,360 | ↑ 731% |
| h03180002 | Middle Pearl-Strong | 435 | ↑ 7909% |
| h03080103 | Lower St. Johns | 150,771 | 109% |
| h03080101 | Upper St. Johns | 2,710 | 58% |
| h07080104 | Flint-Henderson | 583 | ↑ 792% |
| h07080103 | Lower Wapsipinicon | 10,900 | ↑ 1764% |
| h07100009 | Lower Des Moines | 17,000 | ↑ 2009% |
| h07100008 | Lake Red Rock | 489 | ↑ 2919% |
| h07100004 | Middle Des Moines | 5,700 | ↑ 1061% |
| h07100007 | South Raccoon | 343 | ↑ 710% |
| h07100006 | North Raccoon | 1,310 | ↑ 679% |
| h06010101 | North Fork Holston | 1,380 | ↑ 746% |
| h04100011 | Sandusky | 530 | ↑ 4818% |
| h05050005 | Gauley | 3,089 | ↑ 1716% |
| h05050007 | Elk | 1,200 | ↑ 2182% |
| h05040001 | Tuscarawas | 858 | ↑ 1569% |
| h14080104 | Animas | 4,020 | ↑ 948% |
| h14080102 | Piedra | 1,360 | ↑ 1711% |
| h14080101 | Upper San Juan | 2,152 | ↑ 1140% |
| h17110004 | Nooksack | 227 | ↑ 741% |
| h17110002 | Strait Of Georgia | 31 | 106% |
| h15020016 | Lower Little Colorado | 555 | ↑ 4625% |
| h07040002 | Cannon | 1,210 | ↑ 1305% |
| h04100004 | St. Marys | 2,280 | ↑ 10459% |
| h04100005 | Upper Maumee | 6,680 | ↑ 2646% |
| h05010008 | Kiskiminetas | 1,020 | ↑ 1283% |
| h05010007 | Conemaugh | 7,276 | ↑ 1613% |
| h05010006 | Middle Allegheny-Redbank | 915 | ↑ 839% |
| h04100008 | Blanchard | 619 | ↑ 1027% |
| h04100009 | Lower Maumee | 11,100 | ↑ 2114% |
| h04040002 | Pike-Root | 248 | ↑ 1378% |
| h02050304 | Lower Juniata | 527 | ↑ 702% |
| h02050303 | Raystown | 1,657 | ↑ 692% |
| h03160113 | Lower Black Warrior | 2,070 | 73% |
| h18070102 | Santa Clara | 398 | ↑ 4270% |
| h05020006 | Youghiogheny | 1,812 | ↑ 837% |
| h05020004 | Cheat | 208 | ↑ 762% |
| h05020002 | West Fork | 1,060 | ↑ 1491% |
| h14030003 | San Miguel | 160 | ↑ 1905% |
| h14030002 | Upper Dolores | 716 | ↑ 2371% |
| h05020001 | Tygart Valley | 28,410 | ↑ 1772% |
| h07080205 | Middle Cedar | 18,949 | ↑ 945% |
| h07080207 | Upper Iowa | 432 | ↑ 1291% |
| h18070203 | Santa Ana | 338 | ↑ 3189% |
| h07080201 | Upper Cedar | 813 | ↑ 707% |
| h07120004 | Des Plaines | 3,464 | ↑ 1255% |
| h07080208 | Middle Iowa | 8,779 | ↑ 2168% |
| h07080209 | Lower Iowa | 783 | ↑ 2034% |
| h03160106 | Middle Tombigbee-Lubbub | 975 | 70% |
| h12030108 | Richland | 466 | ↑ 5210% |
| h05080001 | Upper Great Miami | 551 | ↑ 777% |
| h13060001 | Pecos Headwaters | 11,650 | ↑ 102643% |
| h10280201 | Upper Chariton | 409 | ↑ 2509% |
| h13060008 | Rio Hondo | 241 | ↑ 10955% |
| h13020203 | Rio Grande-Albuquerque | 577 | ↑ 4808% |
| h10240010 | Nodaway | 1,310 | ↑ 897% |
| h11100301 | Middle North Canadian | 556 | ↑ 1875% |
| h10200203 | Salt | 1,010 | ↑ 842% |
| h18100200 | Salton Sea | 321 | ↑ 1084% |
| h17110010 | Snoqualmie | 999 | ↑ 424% |
| h07020011 | Le Sueur | 3,230 | ↑ 3713% |
| h17110013 | Duwamish | 384 | 83% |
| h10270102 | Middle Kansas | 296 | ↑ 5861% |
| h10270103 | Delaware | 1,790 | ↑ 950% |
| h05030103 | Mahoning | 2,560 | ↑ 675% |
| h02070001 | South Branch Potomac | 225 | ↑ 776% |
| h07080107 | Skunk | 329 | ↑ 2632% |
| h13020211 | Elephant Butte Reservoir | 1,380 | ↑ 1758% |
| h07080105 | South Skunk | 728 | ↑ 6442% |
| h07090006 | Kishwaukee | 163 | ↑ 12538% |
| h07090002 | Crawfish | 188 | ↑ 620% |
| h03160201 | Middle Tombigbee-Chickasaw | 5,730 | 76% |
| h05040006 | Licking | 303 | ↑ 2090% |
| h10190003 | Middle South Platte-Cherry Creek | 1,430 | ↑ 751% |
| h10190004 | Clear | 270 | ↑ 2288% |
| h07020009 | Blue Earth | 1,800 | ↑ 1098% |
| h11120103 | Upper Prairie Dog Town Fork Red | 1,670 | ↑ 18764% |
| h05060002 | Lower Scioto | 11,693 | ↑ 1188% |
| h05060003 | Paint | 3,916 | ↑ 3402% |
| h05060001 | Upper Scioto | 11,542 | ↑ 1190% |
| h05130101 | Upper Cumberland | 2,850 | ↑ 925% |
| h13060011 | Upper Pecos-Black | 1,162 | ↑ 716% |
| h09010003 | Lower Souris | 260 | ↑ 636% |
| h11020010 | Purgatoire | 342 | ↑ 3826% |
| h04100006 | Tiffin | 443 | ↑ 974% |
| h05030204 | Hocking | 169 | ↑ 966% |
| h05030201 | Little Muskingum-Middle Island | 281 | ↑ 1713% |
| h05030203 | Little Kanawha | 1,203 | ↑ 8413% |
| h05030202 | Upper Ohio-Shade | 182 | ↑ 2373% |
| h13010001 | Rio Grande Headwaters | 384 | ↑ 662% |
| h05130202 | Lower Cumberland-Sycamore | 4,860 | ↑ 607% |
| h17110012 | Lake Washington | 77 | ↑ 285% |
| h07130001 | Lower Illinois-Senachwine Lake | 323 | ↑ 2212% |
98 watersheds are running elevated. Create a free account to see every basin.
Create Free AccountMonitoring & response toolkit
Everything on this page links into Snoflo’s gauge-level data — drill from a national view down to the readings on a single river.
Gauge-level flow reports
Every USGS streamgauge by state — live discharge, gage height, NWS flood stages, and the complete observation history.
Browse gauges →15-day flow forecasts
PULSE probabilistic outlooks on every gauge — median, likely range, and projected stage, refreshed daily.
How PULSE works →Engineering data & reports
Flow-duration statistics, observed peak context, CSV exports, and printable conditions reports for any gauge and date range.
Snoflo for Engineering →Interactive national map
Layer gauges, warnings, watersheds, rain, and recreation across the country on one map.
Open the map →What causes river flooding
Flooding is rarely a single-cause event — multiple factors usually compound. The most common drivers across the U.S.
Heavy rainfall
Persistent rain saturates soils and overwhelms drainage networks. Tropical systems and atmospheric rivers are the worst culprits.
Rapid snowmelt
Spring melt pulses can deliver months of accumulated water in days — especially when warm rain falls on existing snowpack.
Ice jams
Breakup ice can block channels, forcing water to back up and inundate upstream banks. Common on northern rivers in early spring.
Storm surge
Coastal hurricanes push seawater inland. Surge combined with rainfall is the deadliest flood scenario in U.S. history.
Reservoir releases
Controlled dam releases can dramatically increase downstream flow. USACE and USBR publish release schedules, but conditions change fast.
Burn scars
Wildfire-stripped slopes can't absorb rainfall — even modest storms produce dangerous flash floods on burned watersheds for years afterward.
Flood preparedness checklist
Floodwaters rise faster than most people expect. The basics that save lives.
Flood map & river monitoring FAQ
What does "percent of normal" mean?
The current flow at a gauge compared to its seasonal average for this date. 100% means flow is right at the historical norm. 200%+ means twice the typical flow — a strong indicator of flood conditions on small-to-medium rivers. Every gauge-level flow report shows its live percent-of-normal.
What's the difference between a flood watch and a flood warning?
Watch: conditions are favorable for flooding within the next 12–48 hours. Warning: flooding is happening or imminent. Both come from the National Weather Service. Snoflo overlays both as toggleable layers on the map above.
How often does Snoflo's data refresh?
USGS streamgauge readings update every 15 minutes; we re-pull every hour. NWS warning polygons update as the NWS issues them — usually within 5 minutes. FEMA flood zones are static (the National Flood Hazard Layer is updated quarterly).
What is the FEMA flood zone layer?
FEMA's National Flood Hazard Layer (NFHL) shows the 1%-annual-chance ("100-year") and 0.2%-annual-chance ("500-year") floodplains. These are based on long-term hydrologic modeling, not current conditions. Useful for property risk; not a real-time signal.
Can I get an alert when my local river floods?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a threshold (e.g. "alert me at 20 ft stage"), and you'll get a push the moment it crosses. Free with a Snoflo account.
Is Snoflo a substitute for official warnings?
No. Snoflo is informational. For life-safety decisions always follow guidance from local emergency management, the NWS, and law enforcement.
Get pinged before your river crosses flood stage.
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